Sunday, February 19, 2017

elementary set theory - How to Prove mathbbRtimesmathbbRsimmathbbR?

How to prove R×RR?



I know you have to split the problem up into two claims, for each direction to prove that it is a bijection, but i don't know how to go much further than that...

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analysis - Injection, making bijection

I have injection f:AB and I want to get bijection. Can I just resting codomain to f(A)? I know that every function i...